Runnble to wrap RNAfold, part of the Vienna RNA package.Takes a Bio::Seq object and an optional structure string as parameters.If a structure is provided it uses the structure to constrain the foldingprediction (RNAFold -C).The resulting structure string is run-length encoded.

Title : encode_str Usage : my $encoded_str = $runnable->encode_string($string) Function : Does string length encoding to reduce size of structure string : splits strings if they are longer then 200 characters so they : will fit in the transcript attribute table, gives a range value : at the start of the string indicating the start and stop positions of the : structure on the transcript Returns : String Exceptions : None Args : String